Version 1.80 is available upstream. Please consider updating! It seems that version 1.80 is available upstream, while the latest version in the Gentoo tree is 1.79. You think this warning is false? Read more about it here.
The Bouncy Castle Java S/MIME APIs for handling S/MIME protocols. This jar contains S/MIME APIs for JDK 1.8 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. The JavaMail API and the Java activation framework will also be needed.